Gear-cutter.



No. 874,886. PATENT ED DEC. 24, 1907.

F. L. EBER-HARDT.

GEAR CUTTER. I

AAAAAAAA IQH FILED my 25 1907-.

UNITED STATES PATENT GFFIQE.

FREDERICK L. EBERHARDT, OF NEWARK, NEW JERSEY.

GEAR-CUTTER.

Specification of Letters Patent.

Patented Dec. 24, 1907.

Application filed May 25. 1907. Serial No. 375,713,

To all whom it may concern:

Be it known that 'I, FREDERICK L, EBER- HARDT, of the city of Newark and the county of Essex, in the State of New Jersey, have invented certain new and useful Im rovements in Gear-Cutters, of'which the 'ollowing is a specification.

This invention relates primarily ,to circular disk cutters and is especially adapted to.

formed cutters, used in the cutting of gear wheels.

. It has been found in cutting the spaces of gear wheels with circular disk cutters, that when the cutting faces on the periphery of .the cutter were reduced, an increased cutter feed could be maintained over that of an ordinary constructed cutter. In any cutter wherein the continuity of the cutting surfaces are broken, aneasier working cutter is obtained which can be explained in the fact of it giving the chip a vent, or in other words preventing their clogging, by breaking the chips;'furthermore it reduces thcficontinuous frictional surface brought to bear upon the material to beremoved by the said cutter.

The reduced peripheral. cutting face has already been accomplished in the following way: by beveling off alternate teeth on both sides, or the beveling was done on alternate was to have a series of spiral grooves'in the eripheral cutting surface, these grooves, however, tend to shift the blank in the direction of the helical path of the said grooves.

The novelty in the present invention consists in that it embodies the advantage of the reduced peripheral cutting faces, eliminating the disadvantages cited above, existing in the methods heretofore employed to accomplish the same result.

The invention comprises a circular dis cutter having radially projecting teeth with less than one-half the peripheral cutting face cutaway on alternate sides of consecutive teetht 5 L2 the. accompanying drawings Figure 1 'sented at 6 and 7.

licable to a formed cutter, inasmuch as it represents a front elevation of a stepped blocking or stocking out cutter. Fig. A 2 is a sectional end elevation of the same, and Fig. 3'isi an end elevation of a formedfinishing gear cutter embodyingthe present inventlon. .ii 4is'a space out with cutter 'as shown in ig. '3.

Referring to Fig. 2: 1 and 2 represent rectangular depressions in alternate sides of consecutive teeth; in'Fig. 3 they "are repre- Thedistance from 4 to 5'is'slight1y less than one-half of the total cutting face on the periphery, thus eliminating any possibility of leaving a thin film of metal in the center of the space out. It will be further noticed that the distance from 3 to 4 is slight compared with the entire depth to be cut, it being just sufficient to break the continuity of the peripherial cutting face. A cutter so constructed as described, has been found to produce an easier working cutter, enabling a heavier feed to be maintained without seriously impairing the machine in which the said cutter may be used; further it eliminates to a considerable extent the chatter caused by the cutters as heretofore constructed. by reducing the frictional cutting resistance, thus increasing the accuracy of the Space as to the form, also producing more accurate spacing. Neither does'it reduce the oscillating 11% tion in the whee blank being cut, as 18 t e case of a beveled cutter nor the shifting of the blank as in a cutter having spiral grooves in the periphery. W

When using lubricant, the broken cutting surfaces on alternate sides of consecutive teeth allow the forcing of the lubricant to the cutting face of each tooth, thus insuring a more thorough lubrication than can be obtained in cutters as heretofore constructed.

Having described my invention and its method of application, I claim. as new and wish to secure by Letters Patent.

1. As a new article of manufacture, a

circular metal cutter, with radially projecting teeth, having peripheral. and lateral cutting edges the continuity of said peripheral cuttin direction 0 their radii on alternate sides of consecutive teeth, said reduction constitutin'g slightly less than one half the total width of saidperipheral cutting faces.

2. As a new article of manufacture,- a {110 faces slightly reduced in the circular metal cutter, with radially proone half of the total Width of said peripheral jecting teeth, having periphergl anal lateral cutting faces. cuttin edges the continuit 0 sai eri eral sitting faces slightly reduced in lihe FREDERICK L"EBERHARDT' a 5 direction of their radii on alternate sides of Witnesses:

consecutive teeth, said reduction constitut- JOSEPH B. PIERSON, ing rectangular portions slightly less than C. E. IIOLGATE. 

